Phys. Rev. Materials 7, 044004 (2023)
Using microfocused angle-resolved photoemission spectroscopy we investigated microstructures containing regions of single-layer (SL) and bilayer (BL) WSe₂ on graphite substrates at different twist angles between SL WSe₂ and graphite and within the BL WSe₂. Fermi level electrons emitted from the graphite are sharply focused near their K gr points in the Brillouin zone, and, when passing through the WSe₂, get diffracted to form band replicas readily observed in experimental Fermi surface maps from twisted SL WSe₂/graphite. We investigated two twisted BL WSe₂ at twist angles ∼28° and ∼10° and found no evidence of hybridization gaps at the interlayer band-crossing points, that could be precursors of the flat bands at smaller twist angles. Similarly, no such gaps were found for SL WSe₂/graphite. Experimental results are complemented by theoretical density functional theory calculations, which suggest that a formation of hybridization gaps in the WSe₂/graphene (which approximates the experimental WSe₂/graphite system) sensitively depends on the WSe₂ band character at the crossing point with the graphene Dirac band.